Electric ventilating-fan



(No Model.)

0. W. DE MOTT.

' ELECTRIC VENTILATING FAN.

No.v 517,214. Patented Mar. 27, 1894.

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" TATES CHARLES W. DE MOTT, OF BROOKLYN, NEl/V YORK.

ELECTRIC VENTILATING-FAN.

SPECIFICATION forming part of Letters Patent No. 517,214, dated March27, 1894.

Application filed April 17, 1893- Serial No. 470,617. (No model.)

To aZZ whom it may concern:

Be it known that 1, CHARLES W. DE MOTT, a citizen of the United States,and a resident of Brooklyn, in the county of Kings and State of NewYork, have invented new and useful Improvements in ElectricVentilating-Fans, of which the following is a specification.

My invention relates to one or more fans on ahorizontal or approximatelyhorizontal shaft rotatable on its own axis for imparting the usualrotary motion to the fans, and at the same time turning slowly around avertical axis for distributing the air currents for the benefit of acircle of people as sitting around a dining or other table, the fanbeing located within the circle, and it consists of improved simplegearing apparatus connecting the fan with the motor for effecting thesemovements, an electric motor being preferably employed, all ashereinafter fully described reference being made to the accompanyingdrawings in which-- Figure 1, is a side elevation of my improved fan andthe motor supporting and operating it. Fig. 2, is also a side elevation,but in a plane at right angles to that of Fig. 1. Fig. 3, is a planview, with part of the brake apparatus detached. Fig. 4, is a plan 'ofthe brake disk detached from the rest of the machine, and Fig. 5, is aplan view of the bed plate of the fan attachment.

A represents the armature shaft of a motor on the top of which I mountone or more spiral fans a, suitably for blowing the air horizontally orapproximately so, and so as to be geared with the motor shaft in asimple way, and also so as to be slowly shifted around the vertical axisof the fan supports to direct the currents from the position of the fanin all directions laterally. In this example I have mounted the bedplate b, of the fan apparatus on the top of the housings c, of the motorframe and secured it with screws (1. From the center of said bed plate avertical stationary pivot 6, extends a suitable height and on it ispivoted next above said bed plate a pulley d the hub of which rests onthe boss 6' of the bed plate and the upper margin of which is a frictiondriver for communicating motion to the fans a, by means of the frictionpinions f, mounted on the fan shafts g, and bearing on said frictiondriving face with suitable pressure for effecting rotation of the fans,two of which are employed in the machine represented, but there may bethree or four or only one as preferred. The fan shafts are fitted inhearings in a cross-bar h, also pivoted on the standing pivot 6, so asto rotate in a horizontal plane, being supported at a suitable height onthe collar 2', which is adjustable up and down on said pivot with a setscrew j, to secure it with relation to the requisite pressure of thepinions on the friction driving surface of pulley d. The pulley d isgeared with the motor shaft by the pulley k thereon, and the endlessbelt Z, said belt passing over the guide pulleys m, on the fixed studs12, projecting from the bed plate I). It will be seen that the driver (1will rotate the fans and also serve as a turn table to cause them toswing around the standing pivot e, by the effect of its driving force onthe pinions f, which besides rotating the fans will turn the bar h,around its pivot e also, the rotation of the fans being proportionatelyless according to the rapidity of the movement of the fan supporting bararound the pivot, so that if the motion of the fans around the pivot beunrestricted such motion would be too great, and the rotation of thefans would be too slow for best results. I therefore employ a brake tolimit such movement around the vertical axis and to increase the speedof the fans, which brake maybe constructed and applied in various ways.What I represent in this case consists of a disk 0, fitted on thestanding pivot 6, above the cross bar so as to rise and fall freely butnot to rotate, as by an angular hole 8, through the center of the diskand an annular section of the standing pivot, or it may be a round holein the disk and a feather key in the pivot, also round in the section onwhich the disk works, with springs as p, on the upper side of the barbearing against the under side of the disk, and with a coiled spring q,and adjusting nut 25, to adjust the pressure of the disk on the springsof the cross bar. Excessive pressure of the disk on the springs willwholly prevent motion of the fans around the vertical axis, and themotion of the driver d, will be wholly expended in rotating the fans;the motion of the fans around the vertical axis may therefore begraduated as desired by graduating the pressure of the disk 0, onthespring brakes. The pinions f are faced with rubber for good frictionmaterial and for noiseless action.

I claim- 1. The combination with the horizontal pulley geared with themotor shaft, of the horizontal fan shafts and friction pinions of saidshafts resting on the upper surface of the pulley, in the relation forbeing thereby rotated on their own axis, and also carried around thevertical axis of the said pulley, and a brake retarding the movementaround the pulley substantially as described.

2. The combination of the electric motor, the pulley mounted on thevertical axis on CHARLES W. DE MOTT. \Vitnesses:

W. J. MORGAN, O. E. WHITNEY.

